Answer:
Frequency and wavelength
Explanation:
Wave speed is equal to the product of frequency and wavelength. Mathematically, its formula is given by :
[tex]v=f\times \lambda[/tex]
f is the frequency of a wave. It is equal to the number of oscillations per unit time.
[tex]\lambda[/tex] is the wavelength. It is the distance between crest to crest or trough to trough.
So, the correct option is (a)
